GB/T 21968-2008
Technical specification for YBZS range of flame-proof double-speed three-phase induction motors for crane application (English Version)
- Standard No.
- GB/T 21968-2008
- Language
- Chinese, Available in English version
- Release Date
- 2008
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Status
- 2021-06
- Replace By
- GB/T 21968-2020
- Latest
- GB/T 21968-2020
- Scope
- This standard stipulates the type, basic parameters and dimensions, technical requirements, inspection rules and test methods, marking, packaging and warranty period requirements of YBZS series flameproof two-speed three-phase asynchronous motors for hoisting. This standard is applicable to flameproof two-speed three-phase asynchronous motors (hereinafter referred to as motors) used for power transmission of various hoisting machinery. All kinds of motors derived from this series of motors can be implemented as a reference. The explosion-proof performance of this series of motors meets the requirements of GB 3836.2-2000 and is made of explosion-proof type. The explosion-proof marks are Exd I Exd II AT4, Exd II BT4, Exd II CT4. Applicable to coal mine underground equipment and factories of Class II A, II B, and II C respectively, where the ignition temperature is the flammable gas or explosive mixture of steam and air in the T1-T4 group.
GB/T 21968-2008 Referenced Document
- GB 10068-2000 Mechanical vibration of certain machines with shaft heights 56mm and higher-Measurement,evaluation and limits of vibration
- GB 10069.3-2006 Measurement of airborne noise emitted by rotating electrical machines and the noise limits. Part 3: Noise limits
- GB 3836.1-2000 Electrical apparatus for explosive gas atmospheres-Part 1: General requirements
- GB 3836.2-2000 Electrical apparatus for explosive gas atmospheres-Part 2: Flameproof enclosure "d"
- GB 755-2000 Rotating electrical machines-Rating and performance
- GB/T 10069.1-2006 Measurement of airborne noise emitted by rotating electrical machines and the noise limits Part 1: Method for the measurement of airborne noise emitted by rotating electrical machines
- GB/T 1032-2005 Test procedures for three-phase induction motors
- GB/T 1096-2003 Square and Rectangular keys
- GB/T 13306-1991 Plates
- GB/T 191-2000 Packaging-Pictorial marking for handling of goods
- GB/T 1993-1993 Cooling methods for rotating electrical machines
- GB/T 2423.4-1993 Basic environmental testing procedures for electric and electronic products. Test Db:Damp heat,cyclic
- GB/T 4772.1-1999 Dimensions and output series for rotating electrical machines. Part 1: Frame numbers 56 to 400 and flange numbers 55 to 1080
- GB/T 4942.1-2006 Degrees of protection provided by the integral design of rotating electrical machined (IP code) - Classification
- GB/T 757-1993 Conical snaft extension for rotating electrical machines
- GB/T 997-2003 Classification of types of construction and mounting arrangements for rotating electrical machines(IM code)
GB/T 21968-2008 history
- 2020 GB/T 21968-2020 YBZS series flameproof double-speed three-phase induction motors for crane application—Technical specification
- 2008 GB/T 21968-2008 Technical specification for YBZS range of flame-proof double-speed three-phase induction motors for crane application